linux-kernel - Re: [PATCH 33/36] autonuma: powerpc port

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Message-ID: <20120823041557.GA24519@dirshya.in.ibm.com>
Date:	Thu, 23 Aug 2012 09:45:57 +0530
From:	Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Hillf Danton <dhillf@...il.com>, Dan Smith <danms@...ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>,
	Alex Shi <alex.shi@...el.com>,
	Mauricio Faria de Oliveira <mauricfo@...ux.vnet.ibm.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Don Morris <don.morris@...com>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [PATCH 33/36] autonuma: powerpc port

* Benjamin Herrenschmidt <benh@...nel.crashing.org> [2012-08-23 08:56:34]:

> On Thu, 2012-08-23 at 08:01 +1000, Benjamin Herrenschmidt wrote:
> > On Wed, 2012-08-22 at 16:59 +0200, Andrea Arcangeli wrote:
> > > From: Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
> > > 
> > >     * PMD flaging is not required in powerpc since large pages
> > >       are tracked in ptes.
> > >     * Yet to be tested with large pages
> > >     * This is an initial patch that partially works
> > >     * knuma_scand and numa hinting page faults works
> > >     * Page migration is yet to be observed/verified
> > > 
> > > Signed-off-by: Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>
> > > Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
> > 
> > I don't like this.
> 
> What I mean here is that it's fine as a proof of concept ;-) I don't
> like it being in a series aimed at upstream...

I agree.  My intend was to get the ppc64 discussions started and also
see what it takes to get autonuma to a new arch.

> We can try to flush out the issues, but as it is, the patch isn't
> upstreamable imho.

Yes.  The patch is still in RFC phase and good only for
review/testing.

> As for finding PTE bits, I have a few ideas we need to discuss, but
> nothing simple I'm afraid.

Sure Ben, lets try them and find the better fit.

--Vaidy

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